Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
Jiangsu Provincial Academy of Environmental Science, Nanjing 210098, China.
Bioresour Technol. 2018 Nov;268:68-76. doi: 10.1016/j.biortech.2018.06.080. Epub 2018 Jun 23.
This study reported a novel and efficient approach to improve the anaerobic fermentation performance of waste activated sludge (WAS) by the indigenous iron activated persulfate (PS/Fe) treatment. Firstly, the production of short-chain fatty acids (SCFAs), especially acetic acid, was remarkably enhanced within shorter fermentation time. Mechanism investigations demonstrated that the PS/Fe treatment could simultaneously accelerate and enhance the hydrolysis and acidification process while inhibit the methanogenesis during WAS fermentation. The activities of key enzymes and the abundances of anaerobic microorganisms responsible for SCFAs production were stimulated in the presence of PS/Fe which would promote the biological processes. Secondly, the PS/Fe treatment improved the quality of fermentation residue by reducing the toxic organic compounds in the residue and enhancing the dewaterability of fermented sludge, which was beneficial to the final disposal of WAS with added economical and environmental values.
本研究报道了一种新颖而有效的方法，通过土著铁激活过硫酸盐（PS/Fe）处理来提高废活性污泥（WAS）的厌氧发酵性能。首先，在更短的发酵时间内，短链脂肪酸（SCFAs）的生成，特别是乙酸的生成，得到了显著提高。机理研究表明，PS/Fe 处理可以同时加速和增强水解和酸化过程，同时抑制 WAS 发酵过程中的甲烷生成。在 PS/Fe 的存在下，负责 SCFAs 生成的关键酶的活性和厌氧微生物的丰度得到了刺激，这将促进生物过程。其次，PS/Fe 处理通过降低残留有毒有机化合物的含量和提高发酵污泥的脱水性能来改善发酵残留物的质量，这有利于具有附加经济和环境价值的 WAS 的最终处置。
